/*jshint -W086 */
var ROUNDING_FLAG = "rounding is necessary"
function write_date(type/*:number*/, fmt/*:string*/, val, ss0/*:?number*/)/*:string*/ {
	var o="", ss=0, tt=0, y = val.y, out, outl = 0;
	switch(type) {
		case 98: /* 'b' buddhist year */
			y = val.y + 543;
			/* falls through */
		case 121: /* 'y' year */
		switch(fmt.length) {
			case 1: case 2: out = y % 100; outl = 2; break;
			default: out = y % 10000; outl = 4; break;
		} break;
		case 109: /* 'm' month */
		switch(fmt.length) {
			case 1: case 2: out = val.m; outl = fmt.length; break;
			case 3: return months[val.m-1][1];
			case 5: return months[val.m-1][0];
			default: return months[val.m-1][2];
		} break;
		case 100: /* 'd' day */
		switch(fmt.length) {
			case 1: case 2: out = val.d; outl = fmt.length; break;
			case 3: return days[val.q][0];
			default: return days[val.q][1];
		} break;
		case 104: /* 'h' 12-hour */
		switch(fmt.length) {
			case 1: case 2: out = 1+(val.H+11)%12; outl = fmt.length; break;
			default: throw 'bad hour format: ' + fmt;
		} break;
		case 72: /* 'H' 24-hour */
		switch(fmt.length) {
			case 1: case 2: out = val.H; outl = fmt.length; break;
			default: throw 'bad hour format: ' + fmt;
		} break;
		case 77: /* 'M' minutes */
		switch(fmt.length) {
			case 1: case 2: out = val.M; outl = fmt.length; break;
			default: throw 'bad minute format: ' + fmt;
		} break;
		case 115: /* 's' seconds */
			if(fmt != 's' && fmt != 'ss' && fmt != '.0' && fmt != '.00' && fmt != '.000') throw 'bad second format: ' + fmt;
			if(val.u === 0 && (fmt == "s" || fmt == "ss")) return pad0(val.S, fmt.length);
			/*::if(!ss0) ss0 = 0; */
			if(ss0 >= 2) tt = ss0 === 3 ? 1000 : 100;
			else tt = ss0 === 1 ? 10 : 1;
			ss = Math.round((tt)*(val.S + val.u));
			if(ss >= 60*tt) throw ROUNDING_FLAG;
			if(fmt === 's') return ss === 0 ? "0" : ""+ss/tt;
			o = pad0(ss,2 + ss0);
			if(fmt === 'ss') return o.substr(0,2);
			return "." + o.substr(2,fmt.length-1);
		case 90: /* 'Z' absolute time */
		switch(fmt) {
			case '[h]': case '[hh]': out = val.D*24+val.H; break;
			case '[m]': case '[mm]': out = (val.D*24+val.H)*60+val.M; break;
			case '[s]': case '[ss]': out = ((val.D*24+val.H)*60+val.M)*60+(ss0 < 1 ? Math.round(val.S+val.u) : val.S); break;
			default: throw 'bad abstime format: ' + fmt;
		} outl = fmt.length === 3 ? 1 : 2; break;
		case 101: /* 'e' era */
			out = y; outl = 1; break;
	}
	var outstr = outl > 0 ? pad0(out, outl) : "";
	return outstr;
}
/*jshint +W086 */